linux-kernel - Re: [PATCH] ehea: Optional TX/RX path optimized for SMP

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Date:	Mon, 26 Feb 2007 14:43:46 +0100
From:	Jan-Bernd Themann <ossthema@...ibm.com>
To:	Roland Dreier <rdreier@...co.com>
Cc:	netdev <netdev@...r.kernel.org>,
	Christoph Raisch <raisch@...ibm.com>,
	"Jan-Bernd Themann" <themann@...ibm.com>,
	"linux-kernel" <linux-kernel@...r.kernel.org>,
	"linux-ppc" <linuxppc-dev@...abs.org>,
	Marcus Eder <meder@...ibm.com>,
	Thomas Klein <tklein@...ibm.com>,
	Stefan Roscher <stefan.roscher@...ibm.com>
Subject: Re: [PATCH] ehea: Optional TX/RX path optimized for SMP

Hi

> Also, as far as the approach of using tasklets, I think it would be
> better to use the "fake netdev" approach to continue to use NAPI.
> Basically you create a pseudo-netdev for each receive queue and have
> NAPI handle the polling for you -- you could look for
> drivers/net/cxgb3 for an example of this.
> 
Thanks for pointing us to this solution. We are now building a NAPI version
that makes use of these pseudo-netdev. The fairness amongst other netdevices
should be better this way.

> 
> Why make this a module option that the user has to set?  Are there any
> circumstances when someone wouldn't want "significant performance
> improvements?"  If this approach is just better, then it should just
> replace the old code.
> 

We'll change the default behaviour to multi queue, but we'd like to keep
the option to run in a single queue mode for debug and backward compabilty.

Thanks,

Jan-Bernd & Christoph R.
 
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